mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 01:04:08 +08:00
docs: iio: convert to ReST
Rename the iio documentation files to ReST, add an index for them and adjust in order to produce a nice html output via the Sphinx build system. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mauro Carvalho Chehab
Jonathan Cameron
parent
7685010fca
commit
1c349f4fd3
@ -1,12 +1,16 @@
|
||||
Cirrus Logic EP93xx ADC driver.
|
||||
==============================
|
||||
Cirrus Logic EP93xx ADC driver
|
||||
==============================
|
||||
|
||||
1. Overview
|
||||
===========
|
||||
|
||||
The driver is intended to work on both low-end (EP9301, EP9302) devices with
|
||||
5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel
|
||||
touchscreen/ADC module.
|
||||
|
||||
2. Channel numbering
|
||||
====================
|
||||
|
||||
Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets.
|
||||
EP9307, EP9312 and EP9312 have 3 channels more (total 8), but the numbering is
|
||||
@ -17,13 +21,20 @@ Assuming ep93xx_adc is IIO device0, you'd find the following entries under
|
||||
|
||||
+-----------------+---------------+
|
||||
| sysfs entry | ball/pin name |
|
||||
+-----------------+---------------+
|
||||
+=================+===============+
|
||||
| in_voltage0_raw | YM |
|
||||
+-----------------+---------------+
|
||||
| in_voltage1_raw | SXP |
|
||||
+-----------------+---------------+
|
||||
| in_voltage2_raw | SXM |
|
||||
+-----------------+---------------+
|
||||
| in_voltage3_raw | SYP |
|
||||
+-----------------+---------------+
|
||||
| in_voltage4_raw | SYM |
|
||||
+-----------------+---------------+
|
||||
| in_voltage5_raw | XP |
|
||||
+-----------------+---------------+
|
||||
| in_voltage6_raw | XM |
|
||||
+-----------------+---------------+
|
||||
| in_voltage7_raw | YP |
|
||||
+-----------------+---------------+
|
||||
@ -1,6 +1,9 @@
|
||||
===============================
|
||||
Industrial IIO configfs support
|
||||
===============================
|
||||
|
||||
1. Overview
|
||||
===========
|
||||
|
||||
Configfs is a filesystem-based manager of kernel objects. IIO uses some
|
||||
objects that could be easily configured using configfs (e.g.: devices,
|
||||
@ -10,20 +13,22 @@ See Documentation/filesystems/configfs/configfs.txt for more information
|
||||
about how configfs works.
|
||||
|
||||
2. Usage
|
||||
========
|
||||
|
||||
In order to use configfs support in IIO we need to select it at compile
|
||||
time via CONFIG_IIO_CONFIGFS config option.
|
||||
|
||||
Then, mount the configfs filesystem (usually under /config directory):
|
||||
Then, mount the configfs filesystem (usually under /config directory)::
|
||||
|
||||
$ mkdir /config
|
||||
$ mount -t configfs none /config
|
||||
$ mkdir /config
|
||||
$ mount -t configfs none /config
|
||||
|
||||
At this point, all default IIO groups will be created and can be accessed
|
||||
under /config/iio. Next chapters will describe available IIO configuration
|
||||
objects.
|
||||
|
||||
3. Software triggers
|
||||
====================
|
||||
|
||||
One of the IIO default configfs groups is the "triggers" group. It is
|
||||
automagically accessible when the configfs is mounted and can be found
|
||||
@ -31,40 +36,40 @@ under /config/iio/triggers.
|
||||
|
||||
IIO software triggers implementation offers support for creating multiple
|
||||
trigger types. A new trigger type is usually implemented as a separate
|
||||
kernel module following the interface in include/linux/iio/sw_trigger.h:
|
||||
kernel module following the interface in include/linux/iio/sw_trigger.h::
|
||||
|
||||
/*
|
||||
* drivers/iio/trigger/iio-trig-sample.c
|
||||
* sample kernel module implementing a new trigger type
|
||||
*/
|
||||
#include <linux/iio/sw_trigger.h>
|
||||
/*
|
||||
* drivers/iio/trigger/iio-trig-sample.c
|
||||
* sample kernel module implementing a new trigger type
|
||||
*/
|
||||
#include <linux/iio/sw_trigger.h>
|
||||
|
||||
|
||||
static struct iio_sw_trigger *iio_trig_sample_probe(const char *name)
|
||||
{
|
||||
static struct iio_sw_trigger *iio_trig_sample_probe(const char *name)
|
||||
{
|
||||
/*
|
||||
* This allocates and registers an IIO trigger plus other
|
||||
* trigger type specific initialization.
|
||||
*/
|
||||
}
|
||||
}
|
||||
|
||||
static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt)
|
||||
{
|
||||
static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt)
|
||||
{
|
||||
/*
|
||||
* This undoes the actions in iio_trig_sample_probe
|
||||
*/
|
||||
}
|
||||
}
|
||||
|
||||
static const struct iio_sw_trigger_ops iio_trig_sample_ops = {
|
||||
static const struct iio_sw_trigger_ops iio_trig_sample_ops = {
|
||||
.probe = iio_trig_sample_probe,
|
||||
.remove = iio_trig_sample_remove,
|
||||
};
|
||||
};
|
||||
|
||||
static struct iio_sw_trigger_type iio_trig_sample = {
|
||||
static struct iio_sw_trigger_type iio_trig_sample = {
|
||||
.name = "trig-sample",
|
||||
.owner = THIS_MODULE,
|
||||
.ops = &iio_trig_sample_ops,
|
||||
};
|
||||
};
|
||||
|
||||
module_iio_sw_trigger_driver(iio_trig_sample);
|
||||
|
||||
@ -73,21 +78,24 @@ iio-trig-sample module will create 'trig-sample' trigger type directory
|
||||
/config/iio/triggers/trig-sample.
|
||||
|
||||
We support the following interrupt sources (trigger types):
|
||||
|
||||
* hrtimer, uses high resolution timers as interrupt source
|
||||
|
||||
3.1 Hrtimer triggers creation and destruction
|
||||
---------------------------------------------
|
||||
|
||||
Loading iio-trig-hrtimer module will register hrtimer trigger types allowing
|
||||
users to create hrtimer triggers under /config/iio/triggers/hrtimer.
|
||||
|
||||
e.g:
|
||||
e.g::
|
||||
|
||||
$ mkdir /config/iio/triggers/hrtimer/instance1
|
||||
$ rmdir /config/iio/triggers/hrtimer/instance1
|
||||
$ mkdir /config/iio/triggers/hrtimer/instance1
|
||||
$ rmdir /config/iio/triggers/hrtimer/instance1
|
||||
|
||||
Each trigger can have one or more attributes specific to the trigger type.
|
||||
|
||||
3.2 "hrtimer" trigger types attributes
|
||||
--------------------------------------
|
||||
|
||||
"hrtimer" trigger type doesn't have any configurable attribute from /config dir.
|
||||
It does introduce the sampling_frequency attribute to trigger directory.
|
||||
12
Documentation/iio/index.rst
Normal file
12
Documentation/iio/index.rst
Normal file
@ -0,0 +1,12 @@
|
||||
:orphan:
|
||||
|
||||
==============
|
||||
Industrial I/O
|
||||
==============
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
iio_configfs
|
||||
|
||||
ep93xx_adc
|
||||
@ -27,7 +27,7 @@ config IIO_CONFIGFS
|
||||
help
|
||||
This allows configuring various IIO bits through configfs
|
||||
(e.g. software triggers). For more info see
|
||||
Documentation/iio/iio_configfs.txt.
|
||||
Documentation/iio/iio_configfs.rst.
|
||||
|
||||
config IIO_TRIGGER
|
||||
bool "Enable triggered sampling support"
|
||||
|
||||
Loading…
Reference in New Issue
Block a user